js filter 和 map

　　　　ccProgramMasData: Array<CcProgramMasDTO> = [];

　　　　standardIntRateList$: Array<Object> = [];

 

 

 

ccProgramMasData  包含5个元素的数组。

 

 setApproveIntRateList(): void {
        const creditCardType = "88";
        const cardProductType = this.parentForm.root.value.loanApplicationDTO.generalInformationDTO.productType;
        if (creditCardType !== null && cardProductType !== null) {
           
            if (this.ccProgramMasData !== null && this.ccProgramMasData !== undefined) {
                const filteredList: Array<CcProgramMasDTO> = this.ccProgramMasData.filter(data => {
                    if (creditCardType === data.loanCode && cardProductType === data.productType) {
                        return data;
                    }
                });
                if (filteredList !== null && filteredList !== undefined) {
                    this.standardIntRateList$ = filteredList.map(item => ({
                        key: item.programId,
                        name: item.programDesc,
                        value: item.programId,
                    })
                    );
                }
            }
        } 

　　经过 filter 函数后，  

filteredList 数组 过滤出 ccProgramMasData  中满足条件的 2个元素。 再经过 map 函数， 获取的

  standardIntRateList$  值是：

 

 

<div *ngIf="list.length>0 ; then  data else noData">没有更多数据</div>
<ng-template #noData></ng-template>
<ng-template #data>
  <div *ngFor="let i of list">{{i  | json }}</div>
</ng-template>